The link to the original website and the schematics :
I'm trying to build a 2n3904/2n3906 mosfet driver based on the same design, but at 13.5MHz, but am having some problems.
Here are my questions :
I understand the purpose of the 9:4 transformer to be that of impedance matching, however I cannot find any reference on how to calculate the output impedance of the 2n390x push-pull output stage. Judging from the circuit it looks like it's about 200Ohms, but how is this value calculated?
The bottom part of the schematic uses 2 2n3904 BJTs. I'm guessing it's a cascode configuration, but that's not the usual arrangement found in the cascode circuits. What exactly is it?
Is there any hope I can make this work on my 13.5MHz driver driving IRF740 with C_iss=1400pF?